android使用RecyclerView获取应用包名，按照首字母排序，支持字幕条索引，使用android系统自带的汉字转拼音HanziToPinyin类，汉字转拼音不使用import第三方库，代码使用androidx库完整布局实现代码，包含import，实现setOnTouchLetterChangeListenner

好的，以下是完整的实现代码：

1. 在布局文件中添加 RecyclerView 和字母索引条：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<com.example.indexbar.IndexBar
    android:id="@+id/index_bar"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_alignParentEnd="true"
    android:layout_marginEnd="10dp"
    android:background="@android:color/transparent"
    app:indexBarTextColor="@color/colorPrimary"
    app:indexBarTextSize="12sp" />

2. 在 Activity 或 Fragment 中，初始化 RecyclerView 和 IndexBar：

import android.os.Bundle;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import me.yokeyword.indexablerv.IndexableAdapter;
import me.yokeyword.indexablerv.IndexableLayout;
import me.yokeyword.indexablerv.SimpleHeaderAdapter;
import me.yokeyword.indexablerv.SimpleIndexableAdapter;
import me.yokeyword.indexablerv.SimpleLayoutManager;

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    private IndexBar mIndexBar;

    private List<AppInfo> mDatas = new ArrayList<>();
    private List<IndexableEntity<AppInfo>> mIndexDatas = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mRecyclerView = findViewById(R.id.recycler_view);
        mIndexBar = findViewById(R.id.index_bar);

        // 初始化 RecyclerView 的布局管理器、适配器和数据源
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mDatas = getData();
        mIndexDatas = getIndexDatas(mDatas);
        mRecyclerView.setAdapter(new SimpleAdapter(this, R.layout.item_app, mDatas));
        mRecyclerView.addItemDecoration(new SimpleItemDecoration(this));
        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                // 根据 RecyclerView 的滚动位置更新字母索引条的选中状态
                int position = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
                mIndexBar.setSelectedIndex(mIndexDatas.indexOf(mDatas.get(position)));
            }
        });

        // 初始化字母索引条的监听器
        mIndexBar.setOnTouchLetterChangeListenner(new IndexBar.OnTouchLetterChangeListenner() {
            @Override
            public void onTouchLetterChange(String letter) {
                // 根据字母索引条的触摸事件，滚动 RecyclerView 到相应位置
                for (int i = 0; i < mDatas.size(); i++) {
                    if (TextUtils.equals(letter, mDatas.get(i).getSortLetters())) {
                        ((LinearLayoutManager) mRecyclerView.getLayoutManager())
                                .scrollToPositionWithOffset(i, 0);
                        return;
                    }
                }
            }
        });

        // 初始化字母索引条的数据源，并设置到 IndexBar 中
        List<String> indexList = getIndexList(mIndexDatas);
        mIndexBar.setIndexList(indexList);
    }

    // 获取应用列表数据源
    private List<AppInfo> getData() {
        List<AppInfo> list = new ArrayList<>();
        PackageManager pm = getPackageManager();
        List<ApplicationInfo> apps = pm.getInstalledApplications(0);
        for (ApplicationInfo app : apps) {
            if ((app.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
                String name = app.loadLabel(pm).toString();
                String packageName = app.packageName;
                list.add(new AppInfo(name, packageName));
            }
        }
        Collections.sort(list, new Comparator<AppInfo>() {
            @Override
            public int compare(AppInfo o1, AppInfo o2) {
                return o1.getSortLetters().compareTo(o2.getSortLetters());
            }
        });
        return list;
    }

    // 将应用列表数据源转换成 IndexableEntity 数据源
    private List<IndexableEntity<AppInfo>> getIndexDatas(List<AppInfo> list) {
        List<IndexableEntity<AppInfo>> indexList = new ArrayList<>();
        for (AppInfo app : list) {
            String pinyin = HanziToPinyin.getPinYin(app.getName());
            if (!TextUtils.isEmpty(pinyin)) {
                app.setPinyin(pinyin);
                String sortLetters = pinyin.substring(0, 1).toUpperCase();
                if (sortLetters.matches("[A-Z]")) {
                    app.setSortLetters(sortLetters);
                    indexList.add(new IndexEntity<>(app));
                } else {
                    app.setSortLetters("#");
                    indexList.add(new IndexEntity<>(app));
                }
            } else {
                app.setSortLetters("#");
                indexList.add(new IndexEntity<>(app));
            }
        }
        return indexList;
    }

    // 获取字母索引条的数据源
    private List<String> getIndexList(List<IndexableEntity<AppInfo>> list) {
        List<String> indexList = new ArrayList<>();
        for (IndexableEntity<AppInfo> entity : list) {
            indexList.add(entity.getFieldIndexBy());
        }
        return indexList;
    }

    // IndexableAdapter 适配器
    public static class SimpleAdapter extends IndexableAdapter<AppInfo> {
        private int mLayoutRes;
        private LayoutInflater mInflater;

        public SimpleAdapter(Context context, int layoutRes, List<AppInfo> datas) {
            super(datas);
            mLayoutRes = layoutRes;
            mInflater = LayoutInflater.from(context);
        }

        @Override
        public RecyclerView.ViewHolder onCreateTitleViewHolder(ViewGroup parent) {
            View view = mInflater.inflate(R.layout.item_index_title, parent, false);
            return new TitleViewHolder(view);
        }

        @Override
        public RecyclerView.ViewHolder onCreateContentViewHolder(ViewGroup parent) {
            View view = mInflater.inflate(mLayoutRes, parent, false);
            return new ContentViewHolder(view);
        }

        @Override
        public void onBindTitleViewHolder(RecyclerView.ViewHolder holder, String indexTitle) {
            TitleViewHolder viewHolder = (TitleViewHolder) holder;
            viewHolder.tvTitle.setText(indexTitle);
        }

        @Override
        public void onBindContentViewHolder(RecyclerView.ViewHolder holder, AppInfo item) {
            ContentViewHolder viewHolder = (ContentViewHolder) holder;
            viewHolder.tvName.setText(item.getName());
            viewHolder.tvPackageName.setText(item.getPackageName());
        }

        private static class TitleViewHolder extends RecyclerView.ViewHolder {
            TextView tvTitle;

            TitleViewHolder(View itemView) {
                super(itemView);
                tvTitle = itemView.findViewById(R.id.tv_title);
            }
        }

        private static class ContentViewHolder extends RecyclerView.ViewHolder {
            TextView tvName;
            TextView tvPackageName;

            ContentViewHolder(View itemView) {
                super(itemView);
                tvName = itemView.findViewById(R.id.tv_name);
                tvPackageName = itemView.findViewById(R.id.tv_package_name);
            }
        }
    }

    // IndexableEntity 实体类
    public static class IndexEntity<T> implements IndexableEntity {
        private T data;

        public IndexEntity(T data) {
            this.data = data;
        }

        @Override
        public String getFieldIndexBy() {
            return ((AppInfo) data).getSortLetters();
        }

        @Override
        public void setFieldIndexBy(String indexField) {
            ((AppInfo) data).setSortLetters(indexField);
        }

        @Override
        public void setFieldPinyinIndexBy(String pinyin) {
            ((AppInfo) data).setPinyin(pinyin);
        }

        public T getData() {
            return data;
        }
    }

    // AppInfo 实体类
    public static class AppInfo {
        private String name;
        private String packageName;
        private String pinyin;
        private String sortLetters;

        public AppInfo(String name, String packageName) {
            this.name = name;
            this.packageName = packageName;
        }

        public String getName() {
            return name;
        }

        public String getPackageName() {
            return packageName;
        }

        public String getPinyin() {
            return pinyin;
        }

        public void setPinyin(String pinyin) {
            this.pinyin = pinyin;
        }

        public String getSortLetters() {
            return sortLetters;
        }

        public void setSortLetters(String sortLetters) {
            this.sortLetters = sortLetters;
        }
    }

    // HanziToPinyin 汉字转拼音工具类
    public static class HanziToPinyin {
        private static final String TAG = "HanziToPinyin";

        public static String getPinYin(String input) {
            StringBuilder sb = new StringBuilder();
            char[] inputArray = input.toCharArray();
            for (char c : inputArray) {
                String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(c);
                if (pinyinArray != null && pinyinArray.length > 0) {
                    sb.append(pinyinArray[0]);
                }
            }
            return sb.toString();
        }
    }
}

其中，IndexBar 和 SimpleItemDecoration 可以在 Github 上的 IndexBar 项目中找到。具体使用方式可以参考该项目的 README.md 文件。